Danfoss FC 102 Design Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Programming guide Installation guide Installation guide

Contents

The warning/alarm information below defines eachwarning/alarm condition, provides the probable cause forthe condition, and details a remedy or troubleshootingprocedure.WARNING 1, 10 Volts lowThe control card voltage is below 10 V from terminal 50.Remove some of the load from terminal 50, as the 10 Vsupply is overloaded. Max. 15 mA or minimum 590 Ω.A short circuit in a connected potentiometer or improperwiring of the potentiometer can cause this condition.TroubleshootingRemove the wiring from terminal 50. If thewarning clears, the problem is with the wiring. Ifthe warning does not clear, replace the controlcard.WARNING/ALARM 2, Live zero errorThis warning or alarm only appears if programmed in6-01 Live Zero Timeout Function. The signal on one of theanalog inputs is less than 50% of the minimum valueprogrammed for that input. Broken wiring or faulty devicesending the signal can cause this condition.TroubleshootingCheck connections on all the analog inputterminals. Control card terminals 53 and 54 forsignals, terminal 55 common. MCB 101 terminals11 and 12 for signals, terminal 10 common. MCB109 terminals 1, 3, 5 for signals, terminals 2, 4, 6common).Check that the frequency converter programmingand switch settings match the analog signal type.Perform Input Terminal Signal Test.WARNING/ALARM 4, Mains phase lossA phase is missing on the supply side, or the mainsvoltage imbalance is too high. This message also appearsfor a fault in the input rectifier on the frequency converter.Options are programmed at 14-12 Function at MainsImbalance.TroubleshootingCheck the supply voltage and supply currents tothe frequency converter.WARNING 5, DC link voltage highThe intermediate circuit voltage (DC) is higher than thehigh-voltage warning limit. The limit is dependent on thefrequency converter voltage rating. The unit is still active.WARNING 6, DC link voltage lowThe intermediate circuit voltage (DC) is lower than the low-voltage warning limit. The limit is dependent on thefrequency converter voltage rating. The unit is still active.WARNING/ALARM 7, DC overvoltageIf the intermediate circuit voltage exceeds the limit, thefrequency converter trips after a time.TroubleshootingConnect a brake resistorExtend the ramp timeChange the ramp typeActivate the functions in 2-10 Brake FunctionIncrease 14-26 Trip Delay at Inverter FaultIf the alarm/warning occurs during a power sag,use kinetic back-up (14-10 Mains Failure)WARNING/ALARM 8, DC under voltageIf the DC-link voltage drops below the undervoltage limit,the frequency converter checks if a 24 V DC back-upsupply is connected. If no 24 V DC back-up supply isconnected, the frequency converter trips after a fixed timedelay. The time delay varies with unit size.TroubleshootingCheck that the supply voltage matches thefrequency converter voltage.Perform input voltage test.Perform soft charge circuit test.WARNING/ALARM 9, Inverter overloadThe frequency converter is about to cut out because of anoverload (too high current for too long). The counter forelectronic, thermal inverter protection issues a warning at98% and trips at 100%, while giving an alarm. Thefrequency converter cannot be reset until the counter isbelow 90%.The fault is that the frequency converter has run withmore than 100% overload for too long.TroubleshootingCompare the output current shown on the LCPwith the frequency converter rated current.Compare the output current shown on the LCPwith measured motor current.Display the Thermal Drive Load on the LCP andmonitor the value. When running above thefrequency converter continuous current rating,the counter increases. When running below thefrequency converter continuous current rating,the counter decreases.WARNING/ALARM 10, Motor overload temperatureAccording to the electronic thermal protection (ETR), themotor is too hot. Select whether the frequency converterissues a warning or an alarm when the counter reaches100% in 1-90 Motor Thermal Protection. The fault occurswhen the motor runs with more than 100% overload fortoo long.TroubleshootingCheck for motor overheating.Check if the motor is mechanically overloadedCheck that the motor current set in 1-24 MotorCurrent is correct.General Specifications and ... Design GuideMG11BC02 Danfoss A/S © Rev. 06/2014 All rights reserved. 1779 9